Attemperating device



PATENTED JAN. 19, 1904. M. H. SHOENBERG. f

ATTEMPERATING DEVICE.

APPLICATION FILED MAR. 16. 1903.

N0 IODEL.

x--x-lMlI-X-x UNITED STATES Patented January 19, 1904.

PATENT OFFICE.

ATTENIPERATING DEVICE.

SPECIFICATION forming part of Letters Patent No. 750,038, dated January19, 1904.

Appncaion fried March 16, 1903.

To all whom. t may concern:

Be it known that I, MILTON H. SHoENB une, a citizen of the UnitedStates, residing' in the city and county of San Francisco, State ofCalifornia, -have invented an Improvement in Attemperating' Devices; andI hereby declare the following to be a full, clear, and exactdescription of the same.

My invention relates `to improvements in means for heating' air forcedunder pressure through a tube or nozzle, and pertains particularly to animproved air-blast handpicce for dentists and others. Its object is toprovide a simple electrical heating' apparatus whereby air at anypressure or temperature may be instantly obtained by the manipulation ofa sing'le combined cock and switch.

It consists of the parts and the construction and combination of partshereinafter more fully described, having reference to the accompanyingdrawings, in which- Fig'ure l is a longitudinal central section ofdental handpiece, showing my attachment. Fig'. Q is a section ofchambered box and tube connection with diagrammatic lamp-circuit. Fig. 3is an enlarged plan of valve, showing cut-offspring. Fig. 4 is anenlarged transverse section on lines .fc ai, Fig. l, showing' valve openfor warm air. Fig. 5 is the same View with valve closed. Fig. 6 is thesame view with valve opened for cold air. Fig. 7 is a section-line 4`1/y, Fig. 4, showing valve open for warm air. Fig. 8 is a similar viewwith valved closed. Fig. 9 is a similar view with valve opened for coldair.

A represents a block or box inclosing a chamber 2, which communicateswith any convenient or usual source of compressed-air su pply. rIheadmission of air to chamber 2 may be controlled by a cock 8. A tube orflexible conductor 4 connects with box A and carries on its outer endthe heatingl mechanism by which the airis attemperated immediatelybefore being' discharged from the nozzle. rIhis heating mechanismcomprises an insulatorsection 5, longitudinally perforated to one sideof its axis to receive a brass plug' 6, which has an air-passage 7extending' throug'h it. A solid conducting-rodS, insulated from plug' 6,also extends lengthwise through section 5 serai No. 148,037. No modell)and has its ends projecting' beyond the section to allowof the necessaryconnections being' made with it. The ends of section 5 are threaded, oneto receive the union on the end of tube 4 and the other to receive thedischarge-nozzle 9. The latter is suitably chambered to inclose aresistance-coil l0, which has one end connected with plug' 6 and theother with rod 8. By connecting' up the plug' and rod with a suitablesource of electrical energy and sending a current of air throughthetube-plug'.

and nozzle a hot-air blast will be obtained at the nozzle.

The means of effecting' electrical connection between the .rheostat IOand a source of energy and the means of controlling the current and theair-supply may be effected in a variety of ways. In the present instanceI have shown the box A, carrying two binding-posts ll l2 in an ordinaryincandescentlamp circuit. Post 1l is connected through tube 4L withplug' 6 by means of an insulated wire 13. Post l2 is insulated from boxA and connects in like manner with rod 8 through wire I4. The currentthus in its course through the lamps passes through posts Il, wire 13,plug' 6, rheostat l0, rod 8, wire I4, plug l2 to the lamp-circuit again.As there is no necessity of the rheostat being in circuit when theair-supply is shut off and as there may be times when cold instead ofheated air is desired, I have devised a simple form of combined switchand stopcock whereby the air-supply through the nozzle may be controlledand the current passing' through wires 13 la short-circuited to avoidthe rheostat either when the air-supply is turned on or oli'.Accordingly I use a plugvalve 15, of brass or other good electricalconducting material, passing' transversely through section 5 and plug 6and turnable in the manner of other plug-valves to reg'ulate the air-Howtln'oug'h passage 7. The part of the valve, however, seated in thesection above plug' 6 has a transverse notch 16 nearly severing thevalve. valve-opening in the section, is accommodated in this notch insuch fashion that when the valve is turned to cut off the air the rod 8,valve, and plug' 6 may be in electrical connection and cutout therheostat, and when the Rod 8, which traverses the 9 IOO valve is openeda certain distance the connection between the rod and valve will bebroken and the full current will pass through the rheostat to heatthe'air as desired, and when the valve is turned still farther in thesame direction the valve will be brought again into electricalconnection with the rod to cut out the rheostat, but not so as to cut oithe air,where by a cold blast will be discharged from the nozzle. Henceit is that the valve is a combined hot and cold air controller andswitch. There is no danger of the rheostat burning out, since theHuid-blast keeps it cool. A spring l5 acts to close the valveautomatically as soon as it is let go by the operator.

This heating and air controlling apparatus is applicable wherever anattemperated fluidblast is desired. 1t has been here shown as applied toa dental handpiece, in which connection it has been used with markedsuccess.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,

l. The combination of a suitable support interposable in afluid-conduit; a rheostat carried by said support; and connectionsincluding a conducting-plug parallel with the support and having ahuid-passage through it, and a solid conductor parallel with the saidperforated plug said rheostat in electrical connection with theconductor and plug.

2. The combination of opposing unions forming a part of a fluid-conduit;a section having projecting ends to engage said unions said sectionperforated to one side of its axis; a conducting-plugfitting saidperforations and having a longitudinally-extending fluid-passage; aconductor Vmounted in the section parallel with the plug and having itsends projecting' beyond the section; a rheostat located in a chamberbeyond the section and electrical connections between the same and theconductor and plug; and means for cutting off the fluid-passage in theplug' and short-circuiting the electric current.

3. The combination of opposing unions forming a part of a fluid-conduit;a couplingsection having projecting ends to engage the unions saidsection perforated to one side of its axis; a conducting-plug in saidperfora- 5o tion and having a longitudinal Huid-passage;

a conductor in the section parallel with the plug and electricalconnections between the rheostat and the conductor and plug', one ofsaid unions having a chamber to contain the rheostat; and a plugdisposed at right angles to the plug and conductor and traversing thefluid-passage in the plug, and provided with a port to register withsaid passage, said plug turnably mounted and provided with a re-` cessedside to receive the conductor to maintain the turning plug out ofcontact with the conductor in one position and to contact with the plugto short-circuit the current when the plug is turned into position tocut off the iiuid passage.

4. A iiuid-attemperating apparatus comprising a receiving-chamberconnected with a source of Huid-supply, a discharge-conduit from saidchamber, a discharge-nozzle, an in- 7o sulator-section interposedbetween the conduit and nozzle, said section having a metallic cereprovided with an air passage-way, a cock controlling the iow throughsaid 1' assage-way, an electrical conductor carried by said insulator, 75 a resistance-eoil having one terminal connect ed with said core andthe other with said conductor and extending into the nozzle-chamber,connections of the opposite ends of said conductor and core through saidcond uit with a 8O source of electrical energy, and switch mechanism bywhich the conductor and core are brought into electrical connection tocut out the resistance-coil.

In witness whereof 1 have hereunto set my 8 5 hand.

MILTON H. SHOENBERG. Vitnesses:

S. H. NoURsn, Jsssna C. BnoDnc.

